SN74LS157ML2 [ROCHESTER]
Multiplexer;
| 型号： | SN74LS157ML2 |
| 厂家： | 
Rochester Electronics |
| 描述： | Multiplexer 光电二极管 逻辑集成电路 |
| 文件： | 总8页 (文件大小：73K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN74LS157
Quad 2-Input Multiplexer
The LSTTL/MSI SN74LS157 is a high speed Quad 2-Input
Multiplexer. Four bits of data from two sources can be selected using
the common Select and Enable inputs. The four buffered outputs
present the selected data in the true (non-inverted) form. The LS157
can also be used to generate any four of the 16 different functions of
two variables. The LS157 is fabricated with the Schottky barrier diode
process for high speed and is completely compatible with all
ON Semiconductor TTL families.
http://onsemi.com
LOW
POWER
SCHOTTKY
• Schottky Process for High Speed
• Multifunction Capability
• Non-Inverting Outputs
• Input Clamp Diodes Limit High Speed Termination Effects
• Special Circuitry Ensures Glitch Free Multiplexing
• ESD > 3500 Volts
16
1
PLASTIC
N SUFFIX
CASE 648
GUARANTEED OPERATING RANGES
Symbol
Parameter
Supply Voltage
Min
4.75
0
Typ
5.0
25
Max
5.25
70
Unit
V
V
CC
T
A
Operating Ambient
Temperature Range
°C
16
I
Output Current – High
Output Current – Low
–0.4
8.0
mA
mA
OH
1
I
OL
SOIC
D SUFFIX
CASE 751B
16
1
SOEIAJ
M SUFFIX
CASE 966
ORDERING INFORMATION
Device
Package
16 Pin DIP
SOIC–16
Shipping
SN74LS157N
SN74LS157D
SN74LS157DR2
SN74LS157M
SN74LS157MEL
2000 Units/Box
38 Units/Rail
2500/Tape & Reel
See Note 1
SOIC–16
SOEIAJ–16
SOEIAJ–16
See Note 1
1. For ordering information on the EIAJ version of
the SOIC package, please contact your local
ON Semiconductor representative.
Semiconductor Components Industries, LLC, 2002
1
Publication Order Number:
February, 2002 – Rev. 8
SN74LS157/D
SN74LS157
V
CC
E
I
0c
I
1c
Z
c
I
0d
I
1d
Zd
16
15
14
13
12
11
10
9
NOTE: The Flatpak version has the same
pinouts (Connection Diagram) as
the Dual In-Line Package.
1
2
3
4
5
6
8
7
S
I
0a
I
1a
Z
a
I
0b
I
1b
Z
b
GND
LOADING (Note a)
HIGH
LOW
PIN NAMES
S
E
Common Select Input
1.0 U.L.
1.0 U.L.
0.5 U.L.
0.5 U.L.
10 U.L.
0.5 U.L.
0.5 U.L.
0.25 U.L.
0.25 U.L.
5 U.L.
Enable (Active LOW) Input
Data Inputs from Source 0
Data Inputs from Source 1
Multiplexer Outputs
I
0a
I
1a
– I
– I
0d
1d
Z – Z
a
d
NOTES: a) 1 TTL Unit Load (U.L.) = 40 mA HIGH/1.6 mA LOW.
Figure 1. Connection Diagram DIP (TOP VIEW)
15 2 3
5 6 14 13 11 10
E I
I
I
I
I
I
I
I
0a 1a 0b 1b 0c 1c 0d 1d
1
S
Z
a
Z
b
Z
c
Z
d
4
7
12
9
V
CC
= PIN 16
GND = PIN 8
Figure 2. Logic Symbol
http://onsemi.com
2
SN74LS157
11
2
3
5
6
14
13
10 15
1
V
= PIN 16
CC
GND = PIN 8
= PIN NUMBERS
4
7
12
9
Figure 3. Logic Diagram
FUNCTIONAL DESCRIPTION
A common use of the LS157 is the moving of data from
two groups of registers to four common output busses. The
particular register from which the data comes is determined
by the state of the Select Input. A less obvious use is as a
function generator. The LS157 can generate any four of
the 16 different functions of two variables with one variable
common. This is useful for implementing highly irregular
logic.
The LS157 is a Quad 2-Input Multiplexer fabricated with
the Schottky barrier diode process for high speed. It selects
four bits of data from two sources under the control of a
common Select Input (S). The Enable Input (E) is active
LOW. When E is HIGH, all of the outputs (Z) are forced
LOW regardless of all other inputs.
The LS157 is the logic implementation of a 4-pole,
2-position switch where the position of the switch is
determined by the logic levels supplied to the Select Input.
The logic equations for the outputs are:
Za = E (I1a S + I0a S)
Zc = E (I1c S + I0c S)
Zb = E (I1b S + I0b S)
Zd = E (I1d S + I0d S)
TRUTH TABLE
SELECT
INPUT
ENABLE
INPUTS
OUTPUT
E
S
I
0
I
1
Z
H
L
L
L
L
X
H
H
L
X
X
X
L
X
L
H
X
X
L
L
H
L
L
H
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
http://onsemi.com
3
SN74LS157
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Min
Typ
Max
Symbol
Parameter
Input HIGH Voltage
Unit
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
V
2.0
V
IH
0.8
Guaranteed Input LOW Voltage for
All Inputs
V
V
V
Input LOW Voltage
V
V
V
IL
Input Clamp Diode Voltage
Output HIGH Voltage
–0.65
3.5
–1.5
V
V
= MIN, I = –18 mA
IN
IK
CC
= MIN, I = MAX, V = V
IH
CC
OH
IN
2.7
OH
or V per Truth Table
IL
V
V
= V MIN,
CC
0.25
0.35
0.4
0.5
V
V
I
= 4.0 mA
= 8.0 mA
CC
OL
OL
V
OL
Output LOW Voltage
= V or V
IH
IN
IL
I
per Truth Table
Input HIGH Current
I , I
E, S
20
40
µA
mA
mA
V
CC
V
CC
V
CC
= MAX, V = 2.7 V
IN
0
1
I
IH
I , I
0.1
0.2
0
1
= MAX, V = 7.0 V
IN
E, S
Input LOW Current
I , I
–0.4
–0.8
I
IL
= MAX, V = 0.4 V
0
1
IN
E, S
I
I
Short Circuit Current (Note 2)
Power Supply Current
–20
–100
16
mA
mA
V
V
= MAX
= MAX
OS
CC
CC
CC
2. Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (T = 25°C)
A
Limits
Min
Typ
Max
Symbol
Parameter
Propagation Delay
Unit
Test Conditions
t
t
9.0
9.0
14
14
PLH
ns
Figure 2
Data to Output
PHL
t
t
Propagation Delay
Enable to Output
13
14
20
21
V
= 5.0 V
PLH
PHL
CC
ns
ns
Figure 1
Figure 2
C = 15 pF
L
t
t
Propagation Delay
Select to Output
15
18
23
27
PLH
PHL
AC WAVEFORMS
V
IN
1.3 V
1.3 V
V
IN
1.3 V
t
1.3 V
t
t
PLH
t
PHL
PHL
PLH
V
OUT
V
OUT
1.3 V
1.3 V
1.3 V
1.3 V
Figure 1.
Figure 2.
http://onsemi.com
4
SN74LS157
PACKAGE DIMENSIONS
N SUFFIX
PLASTIC PACKAGE
CASE 648–08
ISSUE R
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
–A–
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
16
1
9
8
B
S
INCHES
DIM MIN MAX
MILLIMETERS
MIN
18.80
6.35
3.69
0.39
1.02
MAX
19.55
6.85
4.44
0.53
1.77
F
A
B
C
D
F
0.740
0.250
0.145
0.015
0.040
0.770
0.270
0.175
0.021
0.70
C
L
SEATING
PLANE
–T–
G
H
J
0.100 BSC
0.050 BSC
2.54 BSC
1.27 BSC
K
M
0.008
0.015
0.130
0.305
10
0.21
0.38
3.30
7.74
10
H
J
K
L
0.110
0.295
0
2.80
7.50
0
G
D 16 PL
M
S
_
_
_
_
0.020
0.040
0.51
1.01
M
M
0.25 (0.010)
T A
http://onsemi.com
5
SN74LS157
PACKAGE DIMENSIONS
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751B–05
ISSUE J
–A–
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
16
9
8
–B–
P 8 PL
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
M
S
B
0.25 (0.010)
1
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
G
MILLIMETERS
INCHES
MIN
0.386
DIM MIN
MAX
MAX
0.393
0.157
0.068
0.019
0.049
F
A
B
C
D
F
9.80
3.80
1.35
0.35
0.40
10.00
R X 45
K
_
4.00 0.150
1.75 0.054
0.49 0.014
1.25 0.016
C
G
J
1.27 BSC
0.050 BSC
–T–
SEATING
PLANE
0.19
0.10
0
0.25 0.008
0.25 0.004
0.009
0.009
7
J
M
K
M
P
R
D
16 PL
7
0
_
_
_
_
5.80
0.25
6.20 0.229
0.50 0.010
0.244
0.019
M
S
S
0.25 (0.010)
T
B
A
http://onsemi.com
6
SN74LS157
PACKAGE DIMENSIONS
M SUFFIX
SOEIAJ PACKAGE
CASE 966–01
ISSUE O
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS D AND E DO NOT INCLUDE MOLD
FLASH OR PROTRUSIONS AND ARE MEASURED
AT THE PARTING LINE. MOLD FLASH OR
PROTRUSIONS SHALL NOT EXCEED 0.15 (0.006)
PER SIDE.
16
9
L
E
Q
1
H
E
M
_
4. TERMINAL NUMBERS ARE SHOWN FOR
REFERENCE ONLY.
E
5. THE LEAD WIDTH DIMENSION (b) DOES NOT
INCLUDE DAMBAR PROTRUSION. ALLOWABLE
DAMBAR PROTRUSION SHALL BE 0.08 (0.003)
TOTAL IN EXCESS OF THE LEAD WIDTH
DIMENSION AT MAXIMUM MATERIAL CONDITION.
DAMBAR CANNOT BE LOCATED ON THE LOWER
RADIUS OR THE FOOT. MINIMUM SPACE
BETWEEN PROTRUSIONS AND ADJACENT LEAD
TO BE 0.46 ( 0.018).
1
8
L
DETAIL P
Z
D
VIEW P
e
MILLIMETERS
INCHES
MIN
---
A
DIM MIN
MAX
MAX
0.081
0.008
0.020
0.011
0.413
0.215
c
A
---
0.05
0.35
0.18
9.90
5.10
2.05
A
1
0.20 0.002
0.50 0.014
0.27 0.007
b
c
D
E
10.50
5.45 0.201
0.390
A
1
b
0.13 (0.005)
e
1.27 BSC
0.050 BSC
0.10 (0.004)
M
H
7.40
0.50
1.10
8.20 0.291
0.85 0.020
1.50 0.043
0.323
0.033
0.059
E
L
L
E
0
10
0.90 0.028
10
_
0.035
0.031
M
Q
0
_
_
_
0.70
---
1
Z
0.78
---
http://onsemi.com
7
SN74LS157
ON Semiconductor and
are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular
purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,
including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or
death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold
SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable
attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim
alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
Literature Fulfillment:
JAPAN: ON Semiconductor, Japan Customer Focus Center
4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–0031
Phone: 81–3–5740–2700
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303–675–2175 or 800–344–3860 Toll Free USA/Canada
Fax: 303–675–2176 or 800–344–3867 Toll Free USA/Canada
Email: ONlit@hibbertco.com
Email: r14525@onsemi.com
ON Semiconductor Website: http://onsemi.com
For additional information, please contact your local
Sales Representative.
N. American Technical Support: 800–282–9855 Toll Free USA/Canada
SN74LS157/D
相关型号：
SN74LS157N8
Multiplexer, LS Series, 4-Func, 2 Line Input, 1 Line Output, True Output, TTL, PDIP16, ROHS COMPLIANT, PLASTIC, DIP-16
ROCHESTER
SN74LS157ND
Multiplexer, LS Series, 4-Func, 2 Line Input, 1 Line Output, True Output, TTL, PDIP16, PLASTIC, DIP-16
MOTOROLA
SN74LS157NDS
Multiplexer, LS Series, 4-Func, 2 Line Input, 1 Line Output, True Output, TTL, PDIP16, PLASTIC, DIP-16
MOTOROLA
SN74LS157NP3
Multiplexer, LS Series, 4-Func, 2 Line Input, 1 Line Output, True Output, TTL, PDIP16, PLASTIC, DIP-16
ROCHESTER
SN74LS157NS
LS SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDIP16, PLASTIC, DIP-16
MOTOROLA
©2020 ICPDF网 联系我们和版权申明